NEED HELP Main low beams turn off by itself

[rolo95]

Guys,
My 02 TB is still holding on!
But recently the low beams turn off at random. I switch to High beams with the lever and all ok, i switch back and sometimes they come on and sometimes don't , maybe the relay?

I see the high beams relay on the cover of the fuse box but...no low beams relay?

 

[mrrsm]

 

[rolo95]

 

[rolo95]

Found this one, that is not a regular mechanic relay but like a powermosfet type of solidstate relay, looks like it do not overheat.

https://www.amazon.com/dp/B081LRWSLG/?tag=gmtnation-20

 

[mrrsm]

Right... The intensity of the Headlight Beams are controlled by PWM (Pulse Width Modulation) from the PCM. Ordinarily, because of the *hectic active duty cycle* imposed, using only an ACDelco OEM Version is preferred because nothing else will last under such a high performance demand being placed upon this electronic High Frequency Switching Mechanism. The information linked in the Thread below parallels and explains this otherwise expensive purchase:

NEW GM headlight relay (relay #46) GM part# 13506836

GM has just released a fix for the 2006-07 recall involving some GMT360s. It is a new headlight driver module (HDM relay), GM part #13506836. It replaces part #15016745 which could allow the headlights to cut out if overheated. Our 07 Trailblazer was not recalled in Canada, and I cannot find...

gmtnation.com

Unless this version turns out to be a *Bogus Copy-Cat Version*... You'll get better and more reliable results by spending the $31.44 Up Front and getting the OEM Version and just be done with it. Read the *Buyer Comments* to get more verification that it really solves this problem:

ACDelco 15016745 GM Original Equipment Multi-Purpose Relay

https://www.amazon.com/dp/B0065S6S8Y/?tag=gmtnation-20

By The Way... It would NOT hurt to check out the performance of the inexpensive GM OEM Headlamp Ambient Light Level Sensor and swap in a Brand New One via this one offered by this Link at GMT Nation ...over to Amazon:

GM Genuine Parts 13498957 Automatic Headlamp Control Ambient Light Sensor

https://www.amazon.com/dp/B01E68I120/?tag=gmtnation-20

 

[rolo95]

what the daylight sensor do?

 

[Mooseman]

Controls the daytime running lights.

 

[rolo95]

Haaa, mine is covered up with a dashboard cloth cover!! , No wonder I did not see change in the DRL's in auto or switch on.